Add support for polling transport.

To remove remaining direct calls/linkage into libhwbinder.

Bug: 34388964
Test: wifi works
Change-Id: Idd3928e9a0879434cb71ab63eaca905f174e645e
diff --git a/transport/include/hidl/HidlBinderSupport.h b/transport/include/hidl/HidlBinderSupport.h
index 09111f4..9759af1 100644
--- a/transport/include/hidl/HidlBinderSupport.h
+++ b/transport/include/hidl/HidlBinderSupport.h
@@ -371,6 +371,8 @@
 
 void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin);
 void joinBinderRpcThreadpool();
+int setupBinderPolling();
+status_t handleBinderPoll();
 
 }  // namespace hardware
 }  // namespace android